Truck has had three sets of plug wires and plugs (best wires the ford place had and the best platinum plugs), new fuel filter and one new coil pack installed in the past year. Each time the service engine light would go off and stay off a few days before coming back on. After the light comes on the truck starts to miss at idle and while in overdrive and the truck is under a load such as pulling a hill at cruising speed. If truck is run for a couple of weeks the miss gets worse(runs like it is hitting on four cylinders instead of eight) and mechanics report that the plug wires and plugs are bad and need to be replaced. This has happened three times so this leads me to believe that the plug and wires are not the problem. Computer says that the code indicated the plug wires and plugs but a lot of money and time seems to disprove the diagnostics. Seems like the truck is firing way to hot or something and burning up the plug wires! Any ideas?
Sunday, April 9th, 2006 AT 10:11 PM